2 layers42.5 × 21 mm
LD3985M33R
STMicroelectronicsExtended
-40℃~+125℃@(Tj) 1 150mA 150uA 3.3V 30uVrms 50dB@(10kHz) 60mV@(150mA) 6V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHS
- Part id
- st/LD3985M33R
- Category
- Voltage Regulators, Linear, Low Drop Out (LDO) Regulators
- Package
- SOT-23-5L
- Pins
- 5
- In stock
- 3,059 at JLCPCB (C46243)
- Used on
- 15 open-source boards
Overview
The LD3985M33R is a voltage Regulators, Linear, Low Drop Out (LDO) Regulator made by STMicroelectronics in a SOT-23-5L package with 5 pins. -40℃~+125℃@(Tj) 1 150mA 150uA 3.3V 30uVrms 50dB@(10kHz) 60mV@(150mA) 6V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHS.
PCBKit's library has its KiCad symbol (Regulators:LD3985MxxR, from CERN's library) and its footprint (Package_TO_SOT_SMD:SOT-23-5, from KiCad's library), ready for a KiCad board. 3,059 are in stock at JLCPCB (part C46243). 15 open-source boards in 14 repositories on GitHub use it.
Symbol
Footprint
From the datasheet
14- Supply, least
- 2.5 V · VI, recommended operating min · p. 7
- Supply, most
- 6 V · VI, recommended operating max · p. 7
- Supply, absolute maximum
- 6 V · VI, absolute max DC input voltage · p. 6
- Junction, hottest
- 125 °C · Operating junction temperature max · p. 6
- Takes working
- 170 µA · Quiescent current typical, ON mode, IO = 0 to 150 mA · p. 7
- Takes asleep
- 3 nA · OFF mode quiescent current typical, VINH = 0.4 V · p. 7
- Gives
- 150 mA · Guaranteed output current max · p. 1
- Current limit
- 600 mA · Short-circuit current typical, RL = 0 · p. 7
- Output
- 3.3 V · LD3985M33R fixed nominal output · p. 20
- Dropout
- 20 mV · Dropout typical at IO = 50 mA · p. 7
- Dropout
- 45 mV · Dropout typical at IO = 100 mA · p. 7
- Dropout
- 60 mV · Dropout typical at IO = 150 mA · p. 7
- Junction to case (SOT23-5L/TSOT23)
- 81 K/W · Thermal resistance junction-case · p. 6
- Junction to air (SOT23-5L/TSOT23)
- 255 K/W · Thermal resistance junction-ambient · p. 6
What it is and has
4- Protection
- Internal current and thermal limit · p. 1
- Capacitor compatibility
- Stable with low ESR ceramic capacitors · p. 1
- Shutdown
- Logic-controlled electronic shutdown · p. 1
- Supply voltage rejection
- 60 dB at 1 kHz, 50 dB at 10 kHz · p. 1
Specifications
38| Parameter | Conditions | As printed | Page |
|---|---|---|---|
| DC input voltage VI | min -0.3 · max 6 V | 6 | |
| DC output voltage VO | Upper limit VI+0.3 V | min -0.3 V | 6 |
| Inhibit input voltage VINH | Upper limit VI+0.3 V | min -0.3 V | 6 |
| Storage temperature range TSTG | min -65 · max 150 °C | 6 | |
| Operating junction temperature range TOP | min -40 · max 125 °C | 6 | |
| Thermal resistance junction-case RthJC | SOT23-5L/TSOT23 | max 81 °C/W | 6 |
| Thermal resistance junction-ambient RthJA | SOT23-5L/TSOT23 | max 255 °C/W | 6 |
| Operating input voltage VI | min 2.5 · max 6 V | 7 | |
| Output voltage accuracy, VO(NOM) ≥ 2.5V VO | IO = 1 mA | min -2 · max 2 % of VO(NOM) | 7 |
| Output voltage accuracy, VO(NOM) ≥ 2.5V VO | TJ= -40 to 125 °C | min -3 · max 3 % of VO(NOM) | 7 |
| Line regulation ΔVO | VI = VO(NOM) + 0.5 to 6 V; TJ = -40 to 125 °C | min -0.1 · max 0.1 %/V | 7 |
| Load regulation ΔVO | IO = 1 mA to 150mA, TJ = -40 to 125°C; SOT23-5L/TSOT23-5L; VO(NOM) ≥ 2.5 V | typ 0.0025 · max 0.005 %/mA | 7 |
| Output AC line regulation ΔVO | VI = VO(NOM) + 1 V, IO = 150 mA, tR= tF = 30 us | typ 1.5 mVPP | 7 |
| Quiescent current IQ | ON mode: VINH = 1.2 V; IO = 0 | typ 85 uA | 7 |
| Quiescent current IQ | ON mode: VINH = 1.2 V; IO = 0, TJ= -40 to 125 °C | max 150 uA | 7 |
| Quiescent current IQ | ON mode: VINH = 1.2 V; IO = 0 to 150 mA | typ 170 uA | 7 |
| Quiescent current IQ | ON mode: VINH = 1.2 V; IO = 0 to 150 mA, TJ= -40 to 125 °C | max 250 uA | 7 |
| Quiescent current IQ | OFF mode: VINH = 0.4 V | typ 0.003 uA | 7 |
| Quiescent current IQ | OFF mode: VINH = 0.4 V; TJ= -40 to 125 °C | max 1.5 uA | 7 |
| Dropout voltage VDROP | IO = 1 mA | typ 0.4 mV | 7 |
| Dropout voltage VDROP | IO = 1 mA, TJ= -40 to 125 °C | max 2 mV | 7 |
| Dropout voltage VDROP | IO = 50 mA | typ 20 mV | 7 |
| Dropout voltage VDROP | IO = 50 mA, TJ= -40 to 125 °C | max 35 mV | 7 |
| Dropout voltage VDROP | IO = 100 mA | typ 45 mV | 7 |
| Dropout voltage VDROP | IO = 100 mA, TJ= -40 to 125 °C | max 70 mV | 7 |
| Dropout voltage VDROP | IO = 150 mA | typ 60 mV | 7 |
| Dropout voltage VDROP | IO = 150 mA, TJ= -40 to 125 °C | max 100 mV | 7 |
| Short-circuit current ISC | RL = 0 | typ 600 mA | 7 |
| Supply voltage rejection SVR | VI = VO(NOM)+0.25 V ± VRIPPLE = 0.1 V, IO= 50 mA; f = 1kHz | typ 60 dB | 8 |
| Supply voltage rejection SVR | VI = VO(NOM)+0.25 V ± VRIPPLE = 0.1 V, IO= 50 mA; f = 10kHz | typ 50 dB | 8 |
| Inhibit input logic low VINH | VI = 2.5 V to 6 V, TJ= -40 to 125 °C | max 0.4 V | 8 |
| Inhibit input logic high VINH | VI = 2.5 V to 6 V, TJ= -40 to 125 °C | min 1.2 V | 8 |
| Inhibit input current IINH | VINH = 0.4 V, VI = 6 V; typical ±1 nA | typ 1 nA | 8 |
| Output noise voltage eN | BW = 10 Hz to 100 kHz, CO = 1 uF | typ 30 uVRMS | 8 |
| Turn-on time tON | CBYP = 10 nF | typ 100 · max 250 us | 8 |
| Thermal shutdown TSHDN | typ 160 °C | 8 | |
| Output capacitor CO | Capacitance | min 1 · max 22 uF | 8 |
| Output capacitor CO | ESR | min 5 · max 5000 mΩ | 8 |
Pins, by the datasheet
5- 1 VI
- Input voltage of the LDO. · p. 4
- 2 GND
- Common ground. · p. 4
- 3 VINH
- Inhibit input: ON at VINH ≥ 1.2 V, OFF at VINH ≤ 0.4 V; do not leave floating, no internal pull-down or pull-up. · p. 4
- 4 BYPASS
- Connect an external capacitor, usually 10 nF, to minimize noise voltage. · p. 4
- 5 VO
- Output voltage of the LDO. · p. 4
Ordering codes, by the datasheet
1- LD3985M33R
- SOT23-5L · 3.3 V output · p. 20
- 2 layers60 × 60 mm
- 4 layers58 × 58 mm
- 2 layers22 × 26.4 mm
- 2 layers45 × 45 mm
- 2 layers99.1 × 95.3 mm
- 4 layers40 × 49 mm
ADC
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This repository includes all hard- firm- and software resources realated to MRI ADC Probe developed for measuring gradient fields in a running MRI scanner.
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Questions
Is there a KiCad symbol and footprint for the LD3985M33R?
Yes. The symbol is Regulators:LD3985MxxR and the footprint Package_TO_SOT_SMD:SOT-23-5, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the LD3985M33R?
SOT-23-5L, with 5 pins. Its footprint is drawn on this page.
Where is the LD3985M33R datasheet?
STMicroelectronics publishes it: the Datasheet link on this page opens it.
Where can I order the LD3985M33R?
JLCPCB lists it as part C46243, with 3,059 in stock; the sellers' links on this page open their listings.
What can replace the LD3985M33R?
Parts like it in the library: the ME6211C33M5G-N by MICRONE, the SPX3819M5-L-3-3/TR by MaxLinear, the RT9013-33GB by RICHTEK and the XC6219B332MR by UMW. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the LD3985M33R?
15 boards in 14 repositories on GitHub; the most starred are listed on this page, with their KiCad files.